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package templates
import (
"bytes"
"errors"
"net/mail"
"os"
"path"
"strings"
"text/template"
"time"
"github.com/mitchellh/go-homedir"
)
type TemplateData struct {
To []*mail.Address
Cc []*mail.Address
Bcc []*mail.Address
From []*mail.Address
Date time.Time
Subject string
// Only available when replying with a quote
OriginalText string
OriginalFrom []*mail.Address
OriginalDate time.Time
}
func TestTemplateData() TemplateData {
defaults := map[string]string{
"To": "John Doe <john@example.com>",
"Cc": "Josh Doe <josh@example.com>",
"From": "Jane Smith <jane@example.com>",
"Subject": "This is only a test",
"OriginalText": "This is only a test text",
"OriginalFrom": "John Doe <john@example.com>",
"OriginalDate": time.Now().Format("Mon Jan 2, 2006 at 3:04 PM"),
}
return ParseTemplateData(defaults)
}
func ParseTemplateData(defaults map[string]string) TemplateData {
originalDate, _ := time.Parse("Mon Jan 2, 2006 at 3:04 PM", defaults["OriginalDate"])
td := TemplateData{
To: parseAddressList(defaults["To"]),
Cc: parseAddressList(defaults["Cc"]),
Bcc: parseAddressList(defaults["Bcc"]),
From: parseAddressList(defaults["From"]),
Date: time.Now(),
Subject: defaults["Subject"],
OriginalText: defaults["Original"],
OriginalFrom: parseAddressList(defaults["OriginalFrom"]),
OriginalDate: originalDate,
}
return td
}
func parseAddressList(list string) []*mail.Address {
addrs, err := mail.ParseAddressList(list)
if err != nil {
return nil
}
return addrs
}
func wrapLine(text string, lineWidth int) string {
words := strings.Fields(text)
if len(words) == 0 {
return text
}
var wrapped strings.Builder
wrapped.WriteString(words[0])
spaceLeft := lineWidth - wrapped.Len()
for _, word := range words[1:] {
if len(word)+1 > spaceLeft {
wrapped.WriteRune('\n')
wrapped.WriteString(word)
spaceLeft = lineWidth - len(word)
} else {
wrapped.WriteRune(' ')
wrapped.WriteString(word)
spaceLeft -= 1 + len(word)
}
}
return wrapped.String()
}
func wrapText(text string, lineWidth int) string {
text = strings.ReplaceAll(text, "\r\n", "\n")
lines := strings.Split(text, "\n")
var wrapped strings.Builder
for _, line := range lines {
switch {
case line == "":
// deliberately left blank
case line[0] == '>':
// leave quoted text alone
wrapped.WriteString(line)
default:
wrapped.WriteString(wrapLine(line, lineWidth))
}
wrapped.WriteRune('\n')
}
return wrapped.String()
}
// quote prepends "> " in front of every line in text
func quote(text string) string {
text = strings.ReplaceAll(text, "\r\n", "\n")
lines := strings.Split(text, "\n")
var quoted strings.Builder
for _, line := range lines {
if line == "" {
quoted.WriteString(">\n")
}
quoted.WriteString("> ")
quoted.WriteString(line)
quoted.WriteRune('\n')
}
return quoted.String()
}
var templateFuncs = template.FuncMap{
"quote": quote,
"wrapText": wrapText,
"dateFormat": time.Time.Format,
}
func findTemplate(templateName string, templateDirs []string) (string, error) {
for _, dir := range templateDirs {
templateFile, err := homedir.Expand(path.Join(dir, templateName))
if err != nil {
return "", err
}
if _, err := os.Stat(templateFile); os.IsNotExist(err) {
continue
}
return templateFile, nil
}
return "", errors.New("Can't find template - " + templateName)
}
func ParseTemplateFromFile(templateName string, templateDirs []string, data interface{}) ([]byte, error) {
templateFile, err := findTemplate(templateName, templateDirs)
if err != nil {
return nil, err
}
emailTemplate, err := template.New(templateName).
Funcs(templateFuncs).ParseFiles(templateFile)
if err != nil {
return nil, err
}
var outString bytes.Buffer
if err := emailTemplate.Execute(&outString, data); err != nil {
return nil, err
}
return outString.Bytes(), nil
}
func ParseTemplate(templateText string, data interface{}) ([]byte, error) {
emailTemplate, err :=
template.New("email_template").Funcs(templateFuncs).Parse(templateText)
if err != nil {
return nil, err
}
var outString bytes.Buffer
if err := emailTemplate.Execute(&outString, data); err != nil {
return nil, err
}
return outString.Bytes(), nil
}
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